Do Animals Predict Earthquakes?
Almost everyone who has lived through an earthquake has heard a story like this: the dog barked just before it hit, or the birds went quiet, or the cat hid under the bed the night before. Accounts of animals sensing earthquakes go back to ancient Greece, and they are still shared after nearly every large quake.
So is there something to it? The answer has two parts. Animals probably can notice an earthquake a few seconds before people do. But there is no reliable evidence that they can sense one hours or days ahead in a way that could be used to warn people.
Quick answer
Animals cannot reliably predict earthquakes. Many animals can detect the faint first waves of an earthquake that has already started, which can give them a few seconds' head start on people. Reports of animals acting strangely days before a quake are mostly anecdotes collected afterward, and scientists have not found a consistent, repeatable signal that could be used for warnings.
What animals can sense: seconds, not days
Every earthquake sends out several kinds of seismic waves. The first to arrive are P-waves, which travel fastest but usually shake the ground only gently. Next come S-waves and surface waves, which are slower and cause most of the strong shaking.
Many animals have sharper hearing or more sensitive touch than people, so they may notice the P-wave, or the faint sounds it makes, when people do not. A dog that jumps up a few seconds before the shaking is felt is probably reacting to an earthquake that has already begun. This is the same basic idea that earthquake early warning systems use, only with instruments instead of ears.
Why the stories are so common
Pets and wildlife behave unusually for countless reasons: weather changes, visitors, other animals, illness, hunger or noises people cannot hear. Most of the time, nothing follows. But when an earthquake does happen, people search their memories and naturally connect any odd behavior they noticed earlier.
This is called recall bias. The many times a dog howled at night with no earthquake are forgotten, while the one time it happened before a quake becomes a lasting story. Without records collected before the earthquake, it is very hard to know whether the behavior was truly unusual.
What research has found
Scientists have taken the question seriously. In the 1970s, interest grew after reports that animal behavior was one of the signs considered before the 1975 Haicheng earthquake in China. Researchers in several countries, including the United States, later studied animals in areas with frequent earthquakes, and some have attached sensors to animals to track their movements over long periods.
Some studies have reported changes in animal activity before particular earthquakes. However, results have been hard to repeat, the number of earthquakes studied is small, and it is difficult to rule out other causes. No study has produced a method that gives a clear warning before quakes while staying quiet at other times.
The USGS view
The USGS says that changes in animal behavior cannot be used to predict earthquakes. Even where animal reactions have been reported, scientists have not found a specific, consistent connection between a particular behavior and the occurrence of an earthquake.
That does not mean the question is closed. Researchers remain curious about how animals perceive the world. But for public safety, animal behavior is not part of any official warning system.
What a useful animal warning would need
For animal behavior to become a real warning tool, it would have to meet some demanding tests.
- It would have to appear before most large earthquakes, not just a few.
- It would have to be rare at other times, so that alarms are not constant.
- It would need to be measured in advance, not remembered afterward.
- It would need to say roughly where and when, not just that something might happen somewhere.
- Independent scientists would need to be able to repeat the results.
Keeping pets safe in an earthquake
Since you cannot count on pets for a warning, include them in your plan instead. During shaking, do not try to catch or carry a pet; Drop, Cover and Hold On yourself. Frightened animals often hide or run, so make sure pets wear identification and are microchipped where possible.
Add pet food, water, medicines and a carrier or leash to your emergency supplies. After a quake, keep pets close, because broken glass and damaged fences are common and familiar landmarks may be changed. See earthquake preparedness for families for more planning ideas.
Frequently asked questions
Why did my dog bark right before an earthquake?
Your dog may have sensed the first, gentle P-waves or low sounds of an earthquake that had already started. These arrive a few seconds before the stronger shaking that people usually notice.
Can animals sense earthquakes days in advance?
There is no reliable scientific evidence for this. Reports of animals acting strangely days before an earthquake are mostly remembered after the event and have not been confirmed by repeatable studies.
Should I leave home if my pets act strangely?
No. Pets behave unusually for many reasons, and nearly always nothing follows. A better plan is to secure your home and keep supplies ready so you are prepared whenever an earthquake happens.
Is anyone still studying animals and earthquakes?
Yes. Some researchers continue to study animal movement and behavior in earthquake-prone areas. So far, this work has not produced a validated warning method.
Key takeaway
Animals may notice an earthquake a few seconds before people, because they can sense the first, faint waves. They cannot reliably warn of earthquakes hours or days ahead, so make pets part of your preparedness plan rather than your warning system.
Sources
- Can you predict earthquakes? — U.S. Geological Survey
- Earthquake Hazards Program — U.S. Geological Survey
- Earthquakes — Ready.gov (U.S. Department of Homeland Security)